<template>
  <section class="signature">
    <h1>电子签名测试</h1>
    <div class="signatureBox">
      <div class="canvasBox" ref="canvasHW">
        <canvas ref="canvasF"
                @touchstart='touchStart' @touchmove='touchMove' @touchend='touchEnd'
                @mousedown="mouseDown" @mousemove="mouseMove" @mouseup="mouseUp">
        </canvas>
        <div class="btnBox">
          <button @click="overwrite">重写</button>
          <button @click="commit">提交签名</button>
        </div>
      </div>
    </div>
    <img class="imgCanvas" :src="imgUrl">
  </section>
</template>

<script>
export default {
  name: 'ESign',
  data() {
    return {
      stageInfo: '',
      imgUrl: '',
      client: {},
      points: [],
      canvasTxt: null,
      startX: 0,
      startY: 0,
      moveY: 0,
      moveX: 0,
      endY: 0,
      endX: 0,
      w: null,
      h: null,
      isDown: false,
      isViewAutograph: this.$route.query.isViews > 0,
      contractSuccess: this.$route.query.contractSuccess
    }
  },
  mounted() {
    let canvas = this.$refs.canvasF
    canvas.height = this.$refs.canvasHW.offsetHeight - 5
    canvas.width = this.$refs.canvasHW.offsetWidth - 5
    this.canvasTxt = canvas.getContext('2d')
    this.stageInfo = canvas.getBoundingClientRect()
  },
  methods: {
    //mobile
    touchStart(ev) {
      ev = ev || event
      ev.preventDefault()
      if (ev.touches.length === 1) {
        let obj = {
          x: ev.targetTouches[0].clienX,
          y: ev.targetTouches[0].clientY,
        }
        this.startX = obj.x
        this.startY = obj.y
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
      }
    },
    touchMove(ev) {
      ev = ev || event
      ev.preventDefault()
      if (ev.touches.length === 1) {
        let obj = {
          x: ev.targetTouches[0].clientX - this.stageInfo.left,
          y: ev.targetTouches[0].clientY - this.stageInfo.top
        }
        this.moveY = obj.y
        this.moveX = obj.x
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.startY = obj.y
        this.startX = obj.x
        this.points.push(obj)
      }
    },
    touchEnd(ev) {
      ev = ev || event
      ev.preventDefault()
      if (ev.touches.length === 1) {
        let obj = {
          x: ev.targetTouches[0].clientX - this.stageInfo.left,
          y: ev.targetTouches[0].clientY - this.stageInfo.top
        }
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
      }
    },
    //pc
    mouseDown(ev) {
      ev = ev || event
      ev.preventDefault()
      if (1) {
        let obj = {
          x: ev.offsetX,
          y: ev.offsetY
        }
        this.startX = obj.x
        this.startY = obj.y
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
        this.isDown = true
      }
    },
    mouseMove(ev) {
      ev = ev || event
      ev.preventDefault()
      if (this.isDown) {
        let obj = {
          x: ev.offsetX,
          y: ev.offsetY
        }
        this.moveY = obj.y
        this.moveX = obj.x
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.startY = obj.y
        this.startX = obj.x
        this.points.push(obj)
      }
    },
    mouseUp(ev) {
      ev = ev || event
      ev.preventDefault()
      if (1) {
        let obj = {
          x: ev.offsetX,
          y: ev.offsetY
        }
        this.canvasTxt.beginPath()
        this.canvasTxt.moveTo(this.startX, this.startY)
        this.canvasTxt.lineTo(obj.x, obj.y)
        this.canvasTxt.stroke()
        this.canvasTxt.closePath()
        this.points.push(obj)
        this.points.push({x: -1, y: -1})
        this.isDown = false
      }
    },
    //重写
    overwrite() {
      this.canvasTxt.clearRect(0, 0, this.$refs.canvasF.width, this.$refs.canvasF.height)
      this.points = []
    },
    //提交签名
    commit() {
      this.imgUrl = this.$refs.canvasF.toDataURL();
      console.log(this.$refs.canvasF.toDataURL()) //签名img回传后台
    }
  }
}
</script>

<style scoped>
.signatureBox {
  width: 960px;
  height: 640px;
  box-sizing: border-box;
  overflow: hidden;
  /*background: #fff;*/
  z-index: 100;
  /*display: flex;*/
  /*flex-direction: column;*/
}
.canvasBox {
  width: 800px;
  height: 480px;
  box-sizing: border-box;
  /*flex: 1;*/
}
canvas {
  background: #fff;
  border: 1px solid #7d7d7d;
}
.btnBox {
  padding: 10px;
  text-align: center;
}
.btnBox button:first-of-type {
  /*background: transparent;*/
  border-radius: 4px;
  height: 40px;
  width: 80px;
  font-size: 14px;
}
.btnBox button:last-of-type {
  background: #71b900;
  color: #fff;
  border-radius: 4px;
  height: 40px;
  width: 80px;
  font-size: 14px;
}
</style>
